Bicycle frame



FIG. 1 is a top, front, and left-side perspective view of a bicycle frame showing our new design;

FIG. 2 is a top, rear, and left-side perspective view thereof;

FIG. 3 is a bottom, front, and left-side perspective view thereof;

FIG. 4 is a bottom, rear, and left-side perspective view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front elevation view thereof; and,

FIG. 10 is a rear elevation view thereof.

The broken lines in the drawings illustrate portions of the bicycle frame and environmental structures that form no part of the claimed design. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 